Driver stage current density enhancement

Abstract

A transistor device can include a drain contact operably connected to a drain finger and a source contact operably connected to a source finger. The transistor device can further include diffusion area connected to the drain finger and the source finger to provide current to the drain finger and the source finger. The drain finger can have a length extending along an axis and different drain finger widths along the drain finger length such that current density is equal at each point along the drain finger length. The source finger can have a length extending along the axis and source finger widths along the source finger length such that current density is equal at each point along the source finger length.

What is claimed is: 
     
         1 . A transistor device including:
 a drain contact operably connected to a drain finger;   a source contact operably connected to a source finger;   a diffusion area connected to the drain finger and the source finger to provide current to the drain finger and the source finger;   the drain finger having a drain finger length extending along an axis and a plurality of drain finger widths along the drain finger length; and   the source finger having a source finger length extending along the axis and a plurality of source finger widths along the source finger length.   
     
     
         2 . The transistor device of  claim 1 , wherein the drain finger has a first drain finger width at a point along the drain finger length nearest the drain contact and at least one other drain finger width smaller than the first drain finger width, the at least one other drain finger width being at a point along the drain finger length further from the drain contact than the first drain finger width. 
     
     
         3 . The transistor device of  claim 2 , wherein the source finger has a first source finger width at a point along the source finger length nearest the source contact and at least one other source finger width smaller than the first source finger width, the at least one other source finger width being at a point along the source finger length further from the source contact than the first source finger width. 
     
     
         4 . The transistor device of  claim 2 , wherein the transistor device comprises a plurality of layers. 
     
     
         5 . The transistor device of  claim 4 , further comprising electrical connections between at least two of the plurality of layers, the electrical connections provided below at least one discrete width segment of the source finger and at least one discrete width segment of the drain finger. 
     
     
         6 . The transistor device of  claim 1 , wherein a distance between the drain finger and the source finger is constant along the drain finger length and the source finger length. 
     
     
         7 . The transistor device of  claim 1 , wherein the plurality of drain finger widths include different widths such that current density is substantially equivalent at each point along the drain finger length. 
     
     
         8 . The transistor device of  claim 1 , wherein the plurality of source finger widths includes different widths such that current density is substantially equivalent at each point along the source finger length. 
     
     
         9 . Driver stage circuitry comprising:
 an input terminal and an output terminal; and   at least one transistor device coupled between the input terminal and the output terminal, the transistor device comprising:
 a drain contact operably connected to a drain finger; 
 a source contact operably connected to a source finger; 
 a diffusion area connected to the drain finger and the source finger to provide current to the drain finger and the source finger; 
 the drain finger having a drain finger length extending along an axis and a plurality of drain finger widths along the drain finger length; and 
 the source finger having a source finger length extending along the axis and a plurality of source finger widths along the source finger length. 
   
     
     
         10 . The driver stage circuitry of  claim 9 , wherein the drain finger widths are configured such that current density is equal at each point along the drain finger length. 
     
     
         11 . The driver stage circuitry of  claim 9 , wherein the source finger widths are such that current density is equal at each point along the source finger length. 
     
     
         12 . The driver stage circuitry of  claim 9 , wherein the drain finger has a first drain finger width at a point along the drain finger length nearest the drain contact and at least one other drain finger width smaller than the first drain finger width, the at least one other drain finger width being at a point along the drain finger length further from the drain contact than the first drain finger width. 
     
     
         13 . The driver stage circuitry of  claim 12 , wherein the source finger has a first source finger width at a point along the source finger length nearest the source contact and at least one other source finger width smaller than the first source finger width, the at least one other source finger width being at a point along the source finger length further from the source contact than the first source finger width. 
     
     
         14 . The driver stage circuitry of  claim 12 , wherein the transistor device comprises a plurality of layers. 
     
     
         15 . The driver stage circuitry of  claim 14 , wherein the transistor device further comprises electrical connections between at least two of the plurality of layers, the electrical connections provided below at least one discrete width segment of the source finger and at least one discrete width segment of the drain finger. 
     
     
         16 . The driver stage circuitry of  claim 11 , wherein a distance between the drain finger and the source finger is constant along the drain finger length and the source finger length. 
     
     
         17 . A user device including:
 a front end module including:
 at least one antenna; 
   at least one driver stage circuitry, the at least driver stage circuitry including:
 an input terminal and an output terminal; 
 at least one transistor apparatus coupled between the input terminal and the output terminal, the transistor device comprising:
 a drain contact operably connected to a drain finger; 
 a source contact operably connected to a source finger; 
 a diffusion area connected to the drain finger and the source finger to provide current to the drain finger and the source finger; 
 the drain finger having a drain finger length extending along an axis and a plurality of drain finger widths along the drain finger length; and 
 the source finger having a source finger length extending along the axis and a plurality of source finger widths along the source finger length. 
 
   
     
     
         18 . The user device of  claim 17 , wherein the plurality of drain finger widths include different widths such that current density is substantially equivalent at each point along the drain finger length, and wherein the plurality of source finger widths includes different widths such that the current density is substantially equivalent at each point along the source finger length. 
     
     
         19 . The user device of  claim 18 , wherein the drain finger has a first drain finger width at a point along the drain finger length nearest the drain contact and at least one other drain finger width smaller than the first drain finger width, the at least one other drain finger width being at a point along the drain finger length further from the drain contact than the first drain finger width, and wherein the source finger has a first source finger width at a point along the source finger length nearest the source contact and at least one other source finger width smaller than the first source finger width, the at least one other source finger width being at a point along the source finger length further from the source contact than the first source finger width. 
     
     
         20 . The user device of  claim 17 , including two or more antennas.